Orleans: Update Library and Service Sample

[xiazen]

Sample Interaction with Libraries and Services is using an yahoo finance api which is recently disabled by yahoo, as below is their comment on the reasoning:

It has come to our attention that this service is being used in violation of the Yahoo Terms of Service. As such, the service is being discontinued. For all future markets and equities data research, please refer to finance.yahoo.com.

Need to update the sample to use the new api.

[aprooks]

@sergeybykov looks like this sample is no more, and this task can be closed

[sergeybykov]

@aprooks It's not a formal sample, just some sample code as part of the tutorial. I fixed the link to the page - http://dotnet.github.io/orleans/1.5/Tutorials/Interaction-with-Libraries-and-Services.html.

[aprooks]

Makes sense, thanks. I will check what has to be changed later

[aprooks]

I have checked, and Yahoo API is now available via some hacks. This seems to be the easiest provider with automatic api key generation on request. https://www.alphavantage.co/support/#api-key

I will migrate example for this one

[xiazen]

Thank you !

[aprooks]

see #5108

I have a runnable sample, but not sure if it's worth uploading it. Let me know if adjusting docs was enough

[sergeybykov]

The doc is already good. Thank you!
But if you have a running sample, we could add it to https://github.com/dotnet/orleans/tree/master/Samples/2.0.